body{
    background-image: url("../img/bg.jpg");
}
form{
    margin: 100px auto;
    width: 500px;
    background-color: rgba(255, 255, 255, .8);
    padding: 50px 0 50px 100px;
}

form input {
    height: 30px;
    width: 250px;
    margin-bottom: 10px;
}

form input[name=captcha]{
    width: 100px;
}

form img{
    height: 30px;
    vertical-align: middle;
}

form button{
    height: 30px;
    width: 150px;
    border-radius: 8%;
}

.error{
    margin-left: 20px;
    color: red;
}